David Kestenbaum

Steve Barrett
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David Kestenbaum is a correspondent for NPR, covering science, energy issues and, most recently, the global economy for NPR's multimedia project Planet Money. David has been a science correspondent for NPR since 1999. He came to journalism the usual way — by getting a Ph.D. in physics first.

In his years at NPR, David has covered science's discoveries and its darker side, including the Northeast blackout, the anthrax attacks and the collapse of the New Orleans levees. He has also reported on energy issues, particularly nuclear and climate change.

David has won awards from the American Association for the Advancement of Science, the American Physical Society and the Institute of Electrical and Electronics Engineers.

David worked briefly on the show This American Life, and set up a radio journalism program in Cambodia on a Fulbright fellowship. He also teaches a journalism class at Johns Hopkins University.

David holds a bachelor's of science degree in physics from Yale University and a doctorate in physics from Harvard University.

The story of the birth of accounting begins with numbers. In the 1400s, much of Europe was still using Roman numerals, and finding it really hard to easily add or subtract. (Try adding MCVI to XCIV.)

But fortunately, Arabic numerals (1, 2, 3, 4, etc.) started catching on, and with those numbers, merchants in Venice developed a revolutionary system we now call "double-entry" bookkeeping. This is how it works:

Nearly 13 million Americans have gotten, or will soon be getting, rebates from their health insurance companies. This is because of a provision in the Affordable Care Act (aka Obamacare) that's supposed to force insurance companies to run better.

But while the idea of getting a check from your health insurance company may sound great, some economists worry this rule could actually make health insurance more expensive.

The world inside Mark Zandi's computer model feels pretty familiar. It's full of people who are worried about the economy. Their homes are being foreclosed on. They're paying more for gas. Something like 13 million of them can't find jobs.

When Peterffy was a kid growing up in communist Hungary in the 1950s his buddy went to Austria and brought back a pack of Juicy Fruit gum. Peterffy bought the pack, broke the sticks of gum up into little pieces, and sold them at a profit. The principal at his school was not amused. "Where's your communist conscience?" the principal asked.

Not surprisingly, given story #1, Peterffy moved to the U.S. as a young man.

China's economy sailed through the financial crisis unscathed — at least in the short run.

When the global crisis hit, the country's government-owned banks started lending out lots more money. The money came largely from the savings accounts of ordinary Chinese people. It went largely to finance big construction projects, which helped keep China's economy growing.

In 1978, the farmers in a small Chinese village called Xiaogang gathered in a mud hut to sign a secret contract. They thought it might get them executed. Instead, it wound up transforming China's economy in ways that are still reverberating today.

The contract was so risky — and such a big deal — because it was created at the height of communism in China. Everyone worked on the village's collective farm; there was no personal property.

"Back then, even one straw belonged to the group," says Yen Jingchang, who was a farmer in Xiaogang in 1978. "No one owned anything."

All the instability in the global economy this year has been good for the United States Mint. People in search of a safe place to put their money have been buying gold and silver coins in record numbers.

"Precious metal coins were up $800 million dollars last year and that's approximately thirty some percent," says Richard Peterson, deputy director of the Mint.

According the the Mint's annual report, they sold 45.2 million ounces of gold and silver coins in 2011.

Among the chilly aisles at Murray's Cheese Shop in Manhattan, the entire continent of Europe is represented. Something like 60 percent of the cheese in Murray's comes from the continent, according to Aaron Foster, a cheese buyer at the store.

For all the talk about how the European debt crisis is effecting the global economy, it can be hard to connect it with daily life here in the U.S. Here's one link: Aaron Foster's bonus depends on how cheaply he can buy cheese from Europe. And the price of that cheese is driven largely by the strength (or weakness) of the euro.